package 学生管理;

import com.sun.org.apache.bcel.internal.generic.ALOAD;
import sun.management.Agent;

import java.lang.invoke.SwitchPoint;
import java.util.ArrayList;
import java.util.Scanner;

public class test {
    public static void main(String[] args) {
        ArrayList<Student> array = new ArrayList<>();

        while (true) {
            System.out.println("--------欢迎登录学生管理系统--------");
            System.out.println("1.添加学生");
            System.out.println("2.删除学生");
            System.out.println("3.修改学生");
            System.out.println("4.查看学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择：");

            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();


            switch (line) {
                case "1":
                    //System.out.println("添加学生");
                    addstudent(array);
                    break;
                case "2":
                    //System.out.println("删除学生");
                    deleteStudent(array);
                    break;
                case "3":
                    //System.out.println("修改学生");
                    updateStudent(array);
                    break;
                case "4":
                    //System.out.println("查看学生");
                    findStudent(array);
                    break;
                case "5":
                    System.out.println("退出");
                    System.exit(0);
            }
        }

    }

    public static void addstudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);
        String sid;
        while (true) {
            System.out.println("请输入学生学号：");
            sid = sc.nextLine();

            boolean flag = isUsed(array, sid);
            if (flag) {
                System.out.println("你输入的学号已经被使用，请重新输入");
            } else {
                break;
            }
        }


        System.out.println("请输入学生名字：");
        String name = sc.nextLine();
        System.out.println("请输入学生年龄：");
        String age = sc.nextLine();
        System.out.println("请输入学生居住地：");
        String address = sc.nextLine();

        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        array.add(s);

        System.out.println("添加学生成功！");
    }

    public static void findStudent(ArrayList<Student> array) {
        System.out.println("学号\t\t姓名\t\t年龄\t\t居住地");
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            System.out.println(s.getSid() + "\t\t" + s.getName() + "\t\t" + s.getAge() + "\t\t" + s.getAddress());

        }
    }

    public static void deleteStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入删除学生的学号：");
        String sid = sc.nextLine();

        int index = -1;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (s.getSid().equals(sid)) {
                index = i;
                break;
            }
        }
        if (index == -1) {
            System.out.println("该信息不存在，请重新输入！");
        } else {
            array.remove(index);
            System.out.println("删除学生成功");
        }
    }

    public static void updateStudent(ArrayList<Student> array) {
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入要修改学生的学号");
        String sid = sc.nextLine();

        System.out.println("请输入新的学生姓名:");
        String name = sc.nextLine();
        System.out.println("请输入新的学生年龄:");
        String age = sc.nextLine();
        System.out.println("请输入新的学生居住地:");
        String address = sc.nextLine();

        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);

        for (int i = 0; i < array.size(); i++) {
            Student student = array.get(i);
            if (student.getSid().equals(sid)) {
                array.set(i, s);
                break;
            }
        }

        System.out.println("修改学生成功！");
    }

    public static boolean isUsed(ArrayList<Student> array, String sid) {
        boolean flag = false;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (s.getSid().equals(sid)) {
                flag = true;
                break;
            }
        }
        return flag;
    }
}